FloodZoneMap.org

Flash Flood — Knox, IL

Oct 14, 2017

A slow-moving cold front interacting with an unseasonably warm and humid airmass triggered several rounds of thunderstorms across west-central Illinois during the afternoon and evening of October 14th. The strongest and most persistent storms impacted Knox County, producing scattered wind damage and dropping locally heavy rainfall of 2 to 3 inches. Numerous streets in the city of Galesburg were flooded, with some cars stalling in the high water. The storms weakened as they shifted eastward, w

Source: NOAA National Weather Service Storm Events Database (event 724194). Narrative written by NWS staff at the time of the event.

Flood Risk Context for Knox, IL

This event is one of many recorded floods in Knox County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.

View Knox County flood data →

More Flood Stories

Flash Flood$39.5M damage

Knox, IL · Apr 18, 2013

A nearly stationary frontal boundary interacting with an unseasonably warm and moist airmass brought widespread showers and thunderstorms to parts of central Illinois from the later afternoon of April 17th through the morning of April 18th.

Read the full account →
Flash Flood$1.0M damage

Knox, IL · May 28, 2013

After several days of repeated rainfall, strong thunderstorms produced significant flash flooding across portions of Knox County during the evening of May 28th.

Read the full account →
Flash Flood$100K damage

Knox, IL · May 29, 2011

Thunderstorms initiated across eastern Iowa during the morning of May 29th, then tracked eastward along a stationary frontal boundary into north-central Illinois. A large bow echo signature developed, with the strongest winds remaining north of a Galesburg to Henry line.

Read the full account →
Flash Flood

Knox, IL · Jul 8, 2022

A weak low pressure system was located in southwestern Illinois on the afternoon of July 8, 2022, with a stationary front draped near the I-70 corridor.

Read the full account →